Question

Someone check my answer please

Answer 1

D

Answer 2

I got D.

Answer 3

My mind is blanking on how to do these problems right now, I need sleep lol. Could you show some work? I know how to find the area of the sector, but I'm not sure I'm familiar with how to subtract the area of an isosceles non-right triangle without knowing its height/altitude.

Answer 4

Could you help me with area of a triangle then?

Answer 5

I know it's 20 but, how do I convert 20 to units 2?

Answer 6

That depends on how you got your answer. What steps did you take? It could already be in units squared.

Answer 7

counted in into a sqaure

Answer 8

but, I tried 20 and it shows it was wrong.

Answer 9

Also, I know I must be blanking, because I am not able to figure this one out either. Are you using sine/cosign/tangent rules or only geometry? Also, 20 couldn't be the correct answer, since it would not be possible to fit 20 or the square units inside of the triangle.

Answer 10

Oh you already said that never mind.

Answer 11

Based on looking at how many squares are in the triangle and estimating, it looks like it could be 5 units^2. However, I can't prove it at the moment. I can go do some research and try to get back to you later if that doesn't work.

Answer 12

no;/

Answer 13

You can calculate the area by drawing a rectangle that contains the whole triangle then taking away any area that is not inside the triangle.
So I would draw a rectangle that touched the right and left corners of the triangle. Then it would have area 4x5 = 20.
I would then take away the blank triangle area below the coloured triangle. This has area 4x5x0.5 = 10
Then take away one blank square at the top left, and two triangles at the left and top of area 3x0.5 = 1.5 and 4x0.5 = 2 respectively.
So the total area is 20 - 10 - 1 - 1.5 - 2 = 5.5 sq units